Is Karunya a good university? Does it have a management quota?

Whether a university is good or not depends on a lot of factors and also your expectations. You need to check for their NAAC accreditations, AICTE approval status, NIRF ranking, placement records of 4-5 years, fee, infrastructure, college reputation, academic standards including faculty, and many more. 

You should preferably choose a similarly ranked college and find out how Karunya University fits. As for admissions, Karunya University conducts its own entrance exam called Karunya Entrance Examination (KEE) every year for admissions in its B.Tech programs. 

There is no management quota present at the university as it was abolished in 2012. 

If you want to live in a place that is close to a river, has a beautiful campus and the climate of the city and region should be good, then Karunya is definitely a good university campus.